ll, Subsequent to our return from Christmas Island, certain calculations have been made based on information noted above, although at the time it seemed that the weapon Was less than 1 MTP, the analysis of broken glass and fire would place the yield betwee 1 and 3 MT, In this connection, a London release, date line by November 9 by U,P., stated that "A specially equipped Royal Air Force Valiant jet bomber dropped yesterday's bomb which sources reported was in the 10 MT range," 12, It is interesting to recall some of the conversation which is listed below; a. Dr. Willilam Cook stated that, given a year to 18 months, they would have the technique of building a hydrogen bemb, but they would certainly have it sooner if the United States told them how they designed it, b,. Dr, Cook Was overheard to say that he would not return te Ensland untill Mr,Perney Let nin know if another shot was required, as he (Dr. Cook) felt that the shot met all expectations, It is interesting to note that 2 days later in San Francisco, Rear Admiral Patrick talked with Dr, Cock as he was buying a ticket for London and hoping to arrive no iater than le November SUM W. WHITE, Brig, Gen,., USAF hepusy Chief atucsi Forees Special Weapons Profjests . G, SERPELL PATRICK, RADE, US Director, Atomic Energy Division Office of Chief of Naval Operations Navy Department DMCLASSTFERD B.D. 1ROG8, Seo. 3G Bas AtALE,.E TD a. 2 uernonanegy bsDtLate.isteLL2LOE aa Pi